Abstract: The invention relates to a power source for supplying water-based liquid to a system, the power source comprising a container (5) for the water-based liquid and a pump unit (6) which comprises a pump (7) and a power source (8) for the pump, the pump unit being arranged to supply the water-based liquid from the container to the system via a pipe system (4) which is filled with a liquid.

Abstract: A three-way valve is configured as a solenoid operated diverter when the solenoid is used in parallel with a poppet valve. When the diverter is in a first mode, hydraulic fluid entering a first port exits the valve through a system outlet port while hydraulic fluid entering a second port exits through a second port. The solenoid valve is positioned to close the second port when energized in order to shift the system to a second mode. When the solenoid valve is energized to close the second port so that all of the fluid entering the second port opens the poppet valve and exits through the system outlet. By utilizing a poppet valve in parallel with a solenoid valve rather than a valve spool, the three-way diverter is able to operate at higher pressures and higher fluid flow because Bernoulli effects which cause closing of valve spools used in prior art three-way valves do not adversely affect the poppet valve.

Abstract: A plumbing system which, when ambient outdoor temperatures drop below freezing, circulates water to prevent it from freezing, utilizing a check valve to prevent water from flowing back into the water main and further utilizing a relief valve which can open to the atmosphere and relieve pressure in the system if necessary. The system can have two separate circulation pumps, one for hot water and one for cold water.